I loved seeing Christian Borle on Masters of Sex this week. Any other cool guest stars coming up? — Heather

Indeed! Sunday's episode will introduce Spartacus: Blood and Sand star Erin Cummings as Miss Kitty, a high-end prostitute whom Betty helps Masters recruit for a specific mission that may or may not involve Bill and Virginia's research. Let's just say that Kitty is willing to lend a helping hand with Lester's, ahem, performance problem. In that case, perhaps Dr. Masters should be taking notes.